问题
解答题
化简求值:已知x=
|
答案
∵x=
=2-1 2+ 3
,y=3
=2+1 2- 3
,3
∴原式=(2-
)2-(2+3
)23
=[(2-
)+(2+3
)][(2-3
)-(2+3
)]3
=4×[-2
]3
=-8
.3
化简求值:已知x=
|
∵x=
=2-1 2+ 3
,y=3
=2+1 2- 3
,3
∴原式=(2-
)2-(2+3
)23
=[(2-
)+(2+3
)][(2-3
)-(2+3
)]3
=4×[-2
]3
=-8
.3